Table 2.
Mean values of zetapotential (of six replicates) for different nanomaterials dispersed in various media. DI water + 5 mM NaCl—this medium was employed to compare with the DI results when in the presence of inert background electrolyte. Values are the mean and ±1 SD of six replicates.
| Sample name | DI water (mV) | DI water + 5 mM NaCl (mV) | Fish medium (mV) | Seawater (mV) | Daphnia medium (mV) |
|---|---|---|---|---|---|
| Nanograin CeO2 | 33.0 ± 2.0 | 33.9 ± 1.7 | −11.1 ± 1.0 | N/A | 1.2 ± 0.2 |
| Nanosun ZnO | 24.6 ± 0.4 | 25.2 ± 0.6 | 12.4 ± 0.3 | N/A | 4.9 ± 0.2 |
| Micron ZnO | 20.2 ± 0.4 | 13.9 ± 0.6 | 4.4 ± 0.4 | N/A | −4.6 ± 0.4 |
| Z-COTE ZnO | 24.3 ± 0.4 | 20.8 ± 0.8 | 10.8 ± 0.1 | N/A | 1.3 ± 0.2 |
| Micron CeO2 | −7.0 ± 6.0 | −2.0 ± 2.0 | −22.3 ± 0.5 | N/A | −15.0 ± 0.3 |
| Ceria Dry CeO2 | 28.0 ± 2.0 | 23.0 ± 1.3 | −15.3 ± 0.6 | N/A | −17.4 ± 0.3 |